#! /bin/sh

# work around too old /bin/sh on some systems
test -f /bin/sh5 && test -z "$RUNNING_SH5" \
	&& { UNAMES=`uname -s`; test "x$UNAMES" = xULTRIX; } 2>/dev/null \
	&& { RUNNING_SH5=true; export RUNNING_SH5; exec /bin/sh5 $0 ${1+"$@"}; }
unset RUNNING_SH5

test -f /bin/bsh && test -z "$RUNNING_BSH" \
	&& { UNAMES=`uname -s`; test "x$UNAMES" = xAIX; } 2>/dev/null \
	&& { RUNNING_BSH=true; export RUNNING_BSH; exec /bin/bsh $0 ${1+"$@"}; }
unset RUNNING_BSH

test -f /bin/ksh && test -z "$RUNNING_KSH" \
	&& { UNAMES=`uname -s`; test "x$UNAMES" = xSunOS; } 2>/dev/null \
	&& { RUNNING_KSH=true; export RUNNING_KSH; exec /bin/ksh $0 ${1+"$@"}; }
unset RUNNING_KSH

###
#  Shows wm-icons package configuration.
#  Sets icon links (aliases) to icon-sets in system-wide or user space.
#
#  This program is Copyright 1999, Julian Gilbey <jdg@debian.org>
#  based on an original Perl program by Mikhael Goikhman <migo@homemail.com>
#  This program comes with ABSOLUTELY NO WARRANTY.
#  You are free to redistribute this code under the terms of the
#  GNU General Public License, version 2 or later.
#
###

SCRIPT_NAME=`basename $0`

usage() {
	cat <<EOF
Usage: $SCRIPT_NAME OPTIONS [NAME ICON_SET] ...
   or: $SCRIPT_NAME --remove OPTIONS [NAME] ...
   or: $SCRIPT_NAME --which  OPTIONS [NAME] ...

Options:
  Informational options: display info and exit
    --help           Show this message and exit
    --version        Show version number and copyright information and exit
    --inst-dir       Show wm-icons installed icon directory and exit
    --user-dir       Show wm-icons user icon directory and exit
    --show-defaults  Show default aliases and exit
    --show-aliases   Show the aliases currently present
                     One of --global, --personal, --user-dir must be given
    --show-sets      Show a list of installed icon sets

  Directory selection options: precisely one of these must be used
    --global         Set up global (system-wide) links in the base dir
    --personal       Set up personal links in ~/@userdir@
    --user-dir=USER_DIR   Set up links in USER_DIR

  Choice of links: at least one of these must be given  
    --defaults   Set up default aliases, as shown by --show-defaults
    NAME ICON_SET pairs
                 NAME is icon alias name, ICON_SET is icon set directory
                 for example: mini 16x16-default
                 If NAME already exists as an alias, it is not overwritten
                 Explicit NAMEs override --defaults
    NAME         Just the alias names are given for --remove or --which

  Extra options:
    --remove     Remove the symlinks rather than creating them, return (0, 1)
    --which      Show the icon set for the given alias(es), return (0, 1)
    --quiet      Do not output results of alias manipulating to stdout
    --force      Force overwriting of existing symlinks
EOF
}

version() {
	echo '@VERSION@'
}

if [ $# -eq 0 ]; then usage; exit 0; fi

prefix="@prefix@"
INST_DIR="@icondir@"
USER_DIR="$HOME/@userdir@"
IS_GLOBAL=
IS_PERSONAL=
IS_NEW_USER_DIR=
USE_DEFAULTS=
FORCE=
SHOW_ALIASES=
REMOVE=
WHICH=
ECHO=echo
AWK=@AWK@

# Let's find out about the icon sets in this package
ALL_ICON_SETS="@ALL_ICON_SETS@"
SELECTED_ICON_SETS="@SELECTED_ICON_SETS@"

show_installed_sets() {
	# We can't rely on the currently installed sets to be the same
	# as the compile-time list, but they can be assumed to be a subset
	# of the full list
	set -- $ALL_ICON_SETS
	while [ $# -gt 0 ]; do
		if [ -d "$INST_DIR/$1" ]; then echo $1; fi
		shift
	done
}

show_installed_aliases() {
	if [ ! -d "$WORK_DIR" ]; then
		echo "$WORK_DIR not a directory" >&2
		exit 1
	fi

	cd $WORK_DIR || {
		echo "Can't cd to $WORK_DIR; aborting" >&2;
		exit 1;
	}

	ls -l | $AWK '
		BEGIN {
			split("'"$ALL_ICON_SETS"'", icon_list);
			workdir = "'"$WORK_DIR"'";
			instdir = "'"$INST_DIR"'";
			for (i in icon_list) icons[icon_list[i]] = "";
		}
		/ -> [^ ]*$/ {
			source = $(NF-2); dest = $NF;
			destbase = dest; sub(".*/", "", destbase);
			if (destbase in icons) {
				if (destbase == dest && workdir == instdir) {
					print source " -> " destbase
				}
				if (dest == (instdir "/" destbase)) {
					print source " -> " destbase
				}
			}
		}
	'
}

# If an icon-set is not absolute, the inst-dir is prepended.
STD_LINK_NAMES="menu mini norm"
STD_LINK_PAIRS="menu 16x16-general mini 14x14-general norm 48x48-general"

while [ $# -gt 0 ]; do
	case $1 in
		--help|-help|-h)
			usage; exit 0 ;;
		--version|-version|-v)
			version; exit 0 ;;
		--inst-dir|-inst-dir|-i)
			echo $INST_DIR; exit 0 ;;
		--user-dir|-user-dir|-u)
			IS_NEW_USER_DIR=yes
			shift
			if [ $# -eq 0 -o "`echo '$1' | cut -c1`" = - ]; then
				echo $USER_DIR; exit 0
			fi
			NEW_USER_DIR=$1 ;;
		--user-dir=*|-user-dir=*|-u=*)
			IS_NEW_USER_DIR=yes
			USER_DIR=`expr "$1" : '[^=]*=\(.*\)'` ;;
		--global|-global|-g)
			IS_GLOBAL=yes ;;
		--personal|-personal|-p)
			IS_PERSONAL=yes ;;
		--defaults|-defaults|-d)
			USE_DEFAULTS=yes ;;
		--show-defaults|-show-defaults)
			set -- $STD_LINK_PAIRS
			while [ $# -gt 0 ]; do echo "$1 -> $2"; shift; shift; done
			exit 0 ;;
		--quiet|-quiet|-q)
			ECHO=: ;;
		--force|-force|-f)
			FORCE=yes ;;
		--which|-which|-w)
			WHICH=yes ;;
		--remove|-remove|-r)
			REMOVE=yes ;;
		--show-aliases|-show-aliases)
			SHOW_ALIASES=yes ;;
		--show-sets|-show-sets)
			show_installed_sets; exit 0 ;;
		-s)
			echo "$SCRIPT_NAME: -s is ambiguous option; please use full name instead" >&2;
			exit 1 ;;
		--)
			break ;;
		-*)
			usage >&2; exit 1 ;;
		*)
			break ;;
	esac
	shift
done

# Check combination of options supplied
if [ "$IS_GLOBAL$IS_PERSONAL$IS_NEW_USER_DIR" != yes ]; then
	echo "Must use precisely one of --global, --personal and --user-dir options!" >&2
	exit 1
fi

if [ -n "$IS_GLOBAL" ]; then
	WORK_DIR="$INST_DIR"
elif [ -n "$IS_PERSONAL" -a -z "$HOME" ]; then
	echo "Your \$HOME variable is not set to something meaningful; aborting" >&2
	exit 1
else
	case "$USER_DIR" in
	\~/*)
		if [ -z "$HOME" ]; then
			echo "Your \$HOME variable is not set to something meaningful; aborting" >&2
			exit 1
		fi
		USER_DIR=`echo "$USER_DIR" | sed -e "s,^~,$HOME,"`
		;;
	esac
	WORK_DIR="$USER_DIR"
fi

if [ -n "$SHOW_ALIASES" ]; then show_installed_aliases; exit 0; fi

if [ -z "$REMOVE$WHICH" -a `expr $# % 2` -gt 0 ]; then
	echo "Every 'name' parameter needs an 'icon-set' parameter following it" >&2
	exit 1
fi

if [ -z "$USE_DEFAULTS" -a $# -eq 0 ]; then
	echo "Either --defaults or explicit NAME/ICON-SET pairs must be specified" >&2
	exit 1
fi

if [ -n "$REMOVE" -a -n "$WHICH" ]; then
	echo "Either --remove or --which must be specified, not both" >&2
	exit 1
fi

if [ -n "$REMOVE$WHICH" -a -n "$FORCE" ]; then
	echo "Ignoring --force in presence of --remove or --which" >&2
fi

# Now, is the working directory writable or creatable?
if [ ! -d "$WORK_DIR" ]; then
	if [ -n "$REMOVE$WHICH" ]; then
		$ECHO "$WORK_DIR does not exist; exiting"
		exit 1
	fi

	WORK_DIR_PARENT=`dirname "$WORK_DIR"`
	if [ ! -d "$WORK_DIR_PARENT" ]; then
		echo "Neither $WORK_DIR nor $WORK_DIR_PARENT exist; aborting" >&2
		exit 1
	fi

	if [ ! -w "$WORK_DIR_PARENT" ]; then
		echo "$WORK_DIR does not exist and $WORK_DIR_PARENT is unwritable; aborting" >&2
		exit 1
	fi

	mkdir "$WORK_DIR" || {
		echo "$WORK_DIR does not exist and couldn't create; aborting" >&2;
		exit 1;
	}

elif [ ! -w "$WORK_DIR" ]; then
	echo "$WORK_DIR is unwritable; aborting" >&2
	exit 1
fi

cd $WORK_DIR || {
	echo "Can't cd to $WORK_DIR; aborting" >&2;
	exit 1;
}
$ECHO Handling symlinks in $WORK_DIR

# Ensure explicit choices override defaults
if [ -z "$REMOVE$WHICH" ]; then
	LINK_PAIRS=`{
		if [ "$USE_DEFAULTS" = yes ]; then echo "$STD_LINK_PAIRS"; fi;
		echo $*;
	} | $AWK '
		{ for (i=2; i<=NF; i+=2) link[$(i-1)] = $i }
		END { for (i in link) print i, link[i] }
	'`

	set -- $LINK_PAIRS

	while [ $# -gt 0 ]; do
		name=$1
		case $2 in
			/*)
				iconset=$2 ;;
			*)
				if [ -n "$IS_GLOBAL" ]
					then iconset=$2
					else iconset=$INST_DIR/$2
				fi ;;
		esac
		if [ -L $1 ]; then
			if [ -n "$FORCE" ]; then
				$ECHO "Replacing existing link $name to point to $iconset"
				rm -f $name
				ln -s $iconset $name ||
				echo "Failed to setup symlink $name to $iconset" >&2
			else
				$ECHO "Symlink $name already exists, use --force; skipping"
			fi
		elif [ -e $1 ]; then
			echo "$name already exists but is not a symlink; skipping" >&2
		else
			$ECHO "Setting link $name to point to $iconset"
			ln -s $iconset $name ||
			echo "Failed to setup symlink $name to $iconset" >&2
		fi
		shift; shift
	done
else # Removing or querying symlinks
	STATUS=0
	LINKS=`{
		if [ "$USE_DEFAULTS" = yes ]; then echo "$STD_LINK_NAMES"; fi;
		echo $*;
	} | $AWK '
		{ for (i=1; i<=NF; i++) link[$i] = "" }
		END { delete link[""]; for (i in link) print i }
	'`

	set -- $LINKS

	while [ $# -gt 0 ]; do
		name=$1
		if [ -L $1 ]; then
			if [ -n "$REMOVE" ]; then
				$ECHO "Removing existing link $name"
				rm -f $name
			else # $WHICH
				LS_LINE=`ls -l $1`
				ICON_SET=`expr "$LS_LINE" : '.* -> \(.*\)'`
				$ECHO "$ICON_SET"
			fi
		else
			if [ -e $1 ]; then
				echo "$name already exists but is not a symlink; skipping" >&2
			else
				$ECHO "$name does not exist"
			fi
			STATUS=`expr $STATUS + 1`
		fi
		shift
	done
	exit $STATUS
fi